You can check out the full list below. You won't see names of characters or specific story beats in the list, but there's always the risk of spoilers when looking at a game's Achievements and Trophies ahead of completion, so tread lightly.

A Graug's Heel (10 GP): Capitalize on a Warchief's fear

A Mighty Doom (10 GP): Acquire a level 25 rune

A New Master (15 GP): Brand a Captain while in combat

And it Burns, Burns, Burns (15 GP): Use the detonate ability to burn 50 Uruks

Bearer of the Shining Lamp (20 GP): Collect 100 percent of the Ithildin